Original “Mary Poppins” star Dick Van Dyke says he is certain the sequel, starring Emily Blunt, will be a hit after he filmed a cameo for the much-anticipated new movie.

The Hollywood icon — who at 91 has just been cast as a lead in the upcoming movie “Capture the Flag” — told Page Six, “I just got back from London, filming a cameo in the sequel for the new ‘Mary Poppins.’ People say sequels don’t work, but the people behind it have their hearts in the right place. They insist it is not a sequel, it is an homage. Emily Blunt is a quite good Mary Poppins; she sings well. And they had re-created the original set of Cherry Tree Lane just perfectly that brought back a lot of memories. I was the only original member of the cast who is in it. It’s like bookends for me. And Lin-Manuel [Miranda], who plays the lamplighter, dances very well, I was impressed.”

Van Dyke appears in the scene with the old banker (whom he also played in the original movie). He told us, “This time I play his son, who is not a nice guy. I got to jump up on a desk and do a song-and-dance number, and I thoroughly enjoyed it.”

Of the filming, he said, “You used to have to do a number of takes, but now they use four or five cameras and they get all the angles in one take, which at my age is certainly an advantage.” Following criticism of his cockney (“Cor’ blimey, Mary Poppins!”) accent in the original, Van Dyke added, “They had a dialectician practically handcuffed to me, to make sure this time the dialect was right. I wasn’t a cockney this time, but they still wanted to make sure the accent was right.”

His next movie, “Capture the Flag,” is a comedy about two veterans who compete in a continuous game of one-upmanship over “who gets to raise the flag” in their retirement community. Van Dyke said of the Brothers’ Ink Productions movie, which starts filming soon, “It is about World War II and Korean veterans, the older guys, and it has a wonderful element of a comedy. The interservice rivalries are still there, they are constantly bickering. It moved me that they are kind of forgotten about, they are in an old folks’ home. It seems to me like a story that has to be told.

“There are millions and millions of older people that have been forgotten, not only by the younger generation, but by the government.”

He continued, “I thought this is a story that’s really got to be told. This is one of the best scripts I’ve seen in 10 years. It has drama, it is moving, and the behavior of some of these old coots really made me laugh.”

Of when they’ll start filming, he added, “We are still putting the film together, but I said, we have to move fast, because the cast is all circling the drain.”